Gas burner



FIG. 1 is a view from one side;

FIG. 2 is a view from above;

FIG. 3 is a view from below;

FIG. 4 is a view from the other side;

FIG. 5 is a view from one end;

FIG. 6 is a view from the other end. 

The ornamental design for a gas burner, as shown. 